Experimental Physics and
Industrial Control System

"Jeff Hill" <[email protected]> · Mon, 22 Oct 2007 15:58:15 -0600

Dave,

Unfortunately, it's not currently possible for EDM, or any other EPICS
client, to subscribe for updates to be sent when there are changes in the
limits. Therefore, most clients fetch the limits when they connect and
assume that they don't change after that. Perhaps that might explain EDM's
behavior.

PS: This could be fixed in the database by creating a new subscription
trigger option bit (in addition to DBE_VALUE, DBE_LOG, and DBE_ALARM). In
the current system the limit changes wouldn't be stored on the event queue,
but notification would be, and a current value would be fetched by the
server when sending the subscription update message, and that would probably
be a fully suitable behavior considering that limits don't change very
often. Nevertheless, changes are coming in R3.15 which will allow almost any
data structure to be potentially stored on the event queue (including the
limits).

Jeff

> -----Original Message-----
> From: [email protected] [mailto:tech-talk-
> [email protected]] On Behalf Of Dave Reid
> Sent: Thursday, October 18, 2007 10:27 AM
> To: EPICS tech-talk
> Subject: Visibility settings in EDM
> 
> Hi everyone...
> 
> I'm trying to lay out some EDM screens, and I'd like to use the .HOPR
> and .HIHI values in the visibility settings for some items.  However,
> this doesn't seem to work.  If I put in the actual number values,
> things
> work like I want them to, but it would be great if this could be a more
> dynamic thing.
> 
> Anyone have any experience with this or have a good work around?
> 
> dave

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System